As of Release 3.0, you can store periods of availability of certain materials from vendors in the system. An example is the material "antifreeze", which a particular vendor may be able to supply between October 1 and March 31 only.
In requisitions and other purchasing documents for a material for which the relevant fields are maintained, the specified delivery date is checked by the system. If the date does not lie within the predefined period, the system issues a warning message.
In the general data of the purchasing info record, there are two new fields "Available from" and "Available until", in which you can define the period during which the vendor can supply the material.
The message that the delivery date in the requisition or other purchasing document is outside the period specified in the purchasing info record can be defined as a warning or error message, depending on the user.
If you use these fields, you have the advantage of not having to maintain numerous source list entries.